Title :
Frequency tuning loop for VCOs
Author :
Linares-Barranco, B. ; Rodriguez-Vázquez, A. ; Sanchez-Sinencio, Edgar ; Huertas, J.L.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
A frequency tuning circuit is introduced for VCOs (voltage controlled oscillators) so that the final relationship between oscillating frequency and input control voltage is fixed and independent of nonidealities. This tuning loop is applied to an OTA-C sinusoidal VCO. Such an oscillator has an output frequency-input voltage relationship that depends on temperature, process parameters, and even amplitude of the oscillations. It is shown that, by adding the tuning loop, nonideal dependences will be minimized
Keywords :
tuning; variable-frequency oscillators; OTA-C; VFO; frequency tuning circuit; frequency/voltage convertor; input control voltage; oscillating frequency; sinusoidal VCO; tuning loop; voltage controlled oscillators; Circuit optimization; Filters; Frequency conversion; Frequency locked loops; Signal processing; Temperature control; Temperature dependence; Tuning; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1991., IEEE International Sympoisum on
Print_ISBN :
0-7803-0050-5
DOI :
10.1109/ISCAS.1991.176082
